When you get a chance, take a look at LAOutbackTrail's thread on his trip to Mexico via a two wheeled machine. Looks like an awesome trip.
A Mexican Adventure Expedition - Expedition Portal Forum
A Mexican Adventure Expedition - Expedition Portal Forum
South Tx, NM, and Arizona is close enough for me.

The new trail issue had a good writeup on a 40 used for plow work and around the farm and doing a better job than a tractor.